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Daca a supra 2=b supra 4=c supra 6 si a+2c=7,determinati a,b,c

Răspuns :

a/2=b/4=c/6
b=2a
c=3a
a+2c=7
a+2*3a=7
7a=7
a=1
b=2*1=2
c=3*1=3